The CLI test harness hardcoded KICAD9_SYMBOL_DIR and KICAD9_FOOTPRINT_DIR,
which stopped working after the version bump to KiCad 10. The versioned
env var fallback in KIwxExpandEnvVars could no longer resolve
KICAD8_FOOTPRINT_DIR references in fp-lib-table because the predefined
list only contains KICAD10_FOOTPRINT_DIR.
Dynamically detect the major version from kicad-cli at test startup and
set the matching versioned env vars. Also fix a pre-existing TypeError
when QA_DATA_ROOT is set (str vs Path).
Set footprint_link_issues to ignore in the test project to eliminate
environment-dependent ERC output, and update all three golden files
with the new ignored check entry.
Seth Hillbrand